Bird 43 4041 Thruline Wattmeter Watt Meter Relative RF Field Strength Element
Model 4041: One 9V alkaline "transistor" batter (NEDA 1604A or equivalent). Model 4041 : 10 oz (283 g). Not compatible with APM-16 or 4410A. Frequency Range: 1 MHz-1000 MHz. Dynamic Range: 30 dB min.